Which packaging innovation was initially rejected by consumers in the 1960s but went on to save an estimated 7 billion gallons of milk from spoilage annually?

In the world of retail and product innovation, packaging design has evolved dramatically over the decades. Some packaging inventions have completely transformed how products are preserved, transported, and consumed. This trivia question focuses on a groundbreaking packaging innovation that revolutionized an entire industry and changed consumer habits worldwide. Test your knowledge about this significant retail milestone!

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Tetrapak's aseptic carton packaging
Reynolds' aluminum foil wrap
Tupperware's sealed plastic containers
Zip-Pak's resealable plastic bags